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UNITED STATES PATENT JOHN P. GRUBER, OF NE YORK, N. Y.

IMPROVEMENT iN FILTERENG APPARATUS.

To all whom it may concern:

Be it known that I, JOHN l). GRUBER,of thc city and county ot' New York,and State ot' New York, have invented a new and Improved FilteringApparatus and I do hereby declare that the following is a full, clear,and exact description thereof, reference being had to the accompanyingdrawings, making a part of this specification, in which- Figure l is anelevation of one side ot' the apparatus. Fig. 2 is a vertical centralsection through the apparatus. Fig. 3 is top view of the apparatus withthe cover removed. Fig. 4 is a sectional view of the base of theairpnmp, showing the connection of the pipesj k therewith.

This invention is intended for facilita-ting the operation of filtrationfor making extracts, purifying liquids, separating solid substances fromliquids, and other purposes; and it consists in the employment of anexhausting and forcing' air-pump in conjunction with a vessel having twochambers which are separated from each other by a filtering substance,and which communicate with the exhausting and forcing chambers of thepump, as will be hereinafter described.

To'enable others skilled in the art to understand my invention, I willdescribe its construction and operation.

In the accompanying drawings, A represents a circular vessel, which maybe made ot' any desired capacity, and which should be strengthened andlined with an air-tight substance, so that it will sustain aconsiderable external pressure without liability ot' leaking orcollapsin g.

B represents a movable cover for the vessel A, which is conned in itsplace by means of levers C O C, having hooks on them which catch overprojections a a c at the circumference of the cover and draw this coverdown hard upon the top of the vessel A, as shown in Figs. l and 2. Aring, b, of india-rubber, should be interposed between the cover B andthe edge of the vessel A for the purpose of securing an air-tight jointat this point.

Within the vessel A is ahorizontal partition, D, which is lled withperforations, as shown in Fig. 2, and suitably supported above thebottom of the vessel A by legs D D', so as to forni two chambers, E F.This partition D tits snugiy against the inside surface of thc vessel Awhen in its place, and it can be removed from this vessel at pleasure.

On top of the partition D is a finely-perthrated plate, d, in the centerof which is a perforated cylinder, d', which extends up nearly as highas the chamber E. (Shown in Fig. 2.) The upper surface of' the plate dand the outside surface of the cylinder d are covered with felt, cloth,or other suitable filtering' material. The cylinder cl' may be entirelyor partially covered by a movable cap, IL, which can be adjusted up ordown, as may be desired.

On the outside of the vessel A is an exhausting and forcing air-pump, G,which has a solid piston, g, working in a cylinder, g. Be low the pistong two pipes,j k, are applied to the pump and provided with suitablevalves. The pipe)l conducts air from the upper portion of thepump-barrel into the upper chamber, F, of the vessel A. The pipe lcconducts air from the chamber F of the vessel A into the lower chamberof the pump.

The liquid to be iiltered is poured into the chamber E and the cover Bconned in its place. The pump is then operated and the air in chamber Fexhausted at the same time that air is forced into the chamber E abovethe liquid therein. This will compel the liquid to pass through thefiltering substance and into the chamber F, from which it can be drawnby the cock J.

In making solutions, the cap 7a is elevated so as to allow the clearliquid to be drawn through the cylinder c l above the insolublesubstance upon the lteringmedium. In some cases the solid matter willcompletely cover the filtering substance upon the partition D, andrender it very slow and difficult to force the clear solution throughthe said substance. In such case the liquid is drawn through thecylinder d' above the solid substance as well as through it.'

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination of an exhausting and forcing air-pump witha`iltering-vessel which is constructed with a central ilteringpartition, a movable cover, and with pipes j 7c lead- Witness my hand in thematter of my appliing from the chambers E F to the pump chain cation fora patent on an improved filtering bers7 substantially as described.apparatus this 15th day of February, 1865.

2. The combination of the adjustable imperforated cap h with thecylinder d and partition D d, arranged Within a Vessel, A, whichWritnesses communicates with an exhausting and forcing R. T. CAMPBELL,air-pump7 substantially as described. EDW. SGHAFER.

JOHN l?. GRUBER.

